Ttc...help...please

My SO and I are ttc and this morning I woke up feeling off... Although I got enough sleep I feel drained... My nose is stuffy... My head feels like its swimming... I'm like super dizzy... I've been having small cramps in my lower stomach... I've been feel nauseous on and off all day... I'm extremely moody... I just don't feel like myself... I'm 5dpo... Am I crazy??? Has this happened to anyone else???